I'm wondering if anyone knows if there is a way to play one song on speakers, yet a different song through headphones, using a Mac. I use songs as examples for any given audio. The way I assume this would work is by having some kind of external device that plugs into the aux port on the Mac, that in turn would have multiple inputs for the aux jack for your speakers and also the headphones/earbud jack, and then you could set your web browser playing YouTube to the speakers and your iTunes to the headphones, or something along those lines.
Has anyone heard of anything that would enable you to listen to one song on headphones while the rest of the room listens to another, without interference between the two?